// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// http://code.google.com/p/protobuf/
//
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Author: kenton@google.com (Kenton Varda)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.

#include <google/protobuf/io/printer.h>
#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/stubs/strutil.h>
#include "protoserv/compiler/java/java_helpers.h"
#include "protoserv/compiler/java/java_service_stub.h"
#include "protoserv/protocol.pb.h"

namespace protoserv {
namespace compiler {
namespace java {

ServiceStubGenerator::ServiceStubGenerator(
      const ServiceDescriptor* descriptor)
  : descriptor_(descriptor) {}

ServiceStubGenerator::~ServiceStubGenerator() {}

void ServiceStubGenerator::Generate(io::Printer* printer) {
  bool is_own_file = descriptor_->file()->options().java_multiple_files();
  map<string, string> vars;
  vars["classname"] = descriptor_->name();
  vars["CLASSNAME"] = ToUpperCase(descriptor_->name());
  vars["fileclass"] = ClassName(descriptor_->file()) + "Rpc";
  vars["static"] = is_own_file ? "" : "static";
  printer->Print(vars,
    "public $static$ final class $classname$Stub extends\n"
    "    com.googlecode.protoserv.GenericStub {\n"
    "\n"
    "  public $classname$Stub(com.googlecode.protoserv.RpcChannel channel) {\n"
    "    super(channel);\n"
    "    $fileclass$.registerAllExtensions(this.registry);\n"
    "  }\n"
    "\n"
    "  public $classname$Stub(String url) {\n"
    "    this(com.googlecode.protoserv.RpcChannel.newChannel(url));\n"
    "  }\n"
    "\n");
  printer->Indent();
  for (int i = 0; i < descriptor_->method_count(); i++) {
    GenerateField(descriptor_->method(i), printer);
  }
  printer->Outdent();
  printer->Print("}\n\n");
}

void ServiceStubGenerator::GenerateField(const MethodDescriptor* method,
                                         io::Printer* printer) {
  map<string, string> vars;
  vars["extension_prefix"] = ClassName(descriptor_->file()) + "Rpc." +
      UnderscoresToCamelCase(descriptor_);
  vars["method"] = UnderscoresToCamelCase(method);
  vars["Method"] = method->name();
  vars["inputclass"] = ClassName(method->input_type());
  vars["outputclass"] = ClassName(method->output_type());

  printer->Print(vars,
    "public com.googlecode.protoserv.Rpc<\n"
    "    $outputclass$> $method$(\n"
    "    com.googlecode.protoserv.Rpc<\n"
    "        $outputclass$> rpc,\n"
    "    $inputclass$ request) {\n"
    "  com.googlecode.protoserv.Protocol.RequestProto.Builder requestProto =\n"
    "      com.googlecode.protoserv.Protocol.RequestProto.newBuilder();\n"
    "  requestProto.setExtension(\n"
    "      $extension_prefix$$Method$Input, request);\n"
    "  if (rpc == null) {\n"
    "    rpc = new com.googlecode.protoserv.Rpc<\n"
    "        $outputclass$>();\n"
    "  }\n");
  if (method->options().HasExtension(protoserv::deadline_ms)) {
    const int deadline_ms =
        method->options().GetExtension(protoserv::deadline_ms);
    printer->Print(
      "  if (!rpc.hasDeadlineMs()) {\n"
      "    rpc.setDeadlineMs($deadline$);\n"
      "  }\n",
      "deadline", SimpleItoa(deadline_ms));
  }
  printer->Print(vars,
    "  rpc.setResponseExtension(\n"
    "      $extension_prefix$$Method$Output);\n"
    "  this.channel.invoke(rpc, requestProto);\n"
    "  return rpc;\n"
    "}\n\n");

  printer->Print(vars,
    "public com.googlecode.protoserv.Rpc<\n"
    "    $outputclass$> $method$(\n"
    "    com.googlecode.protoserv.Rpc<\n"
    "        $outputclass$> rpc");
  printer->Indent();
  printer->Indent();
  for (int j = 0; j < method->input_type()->field_count(); ++j) {
    const FieldDescriptor* field = method->input_type()->field(j);
    printer->Print(",\n$type$ $name$",
                   "type", ClassName(field),
                   "name", field->name());
  }
  printer->Print(
    ") {\n");
  printer->Outdent();
  printer->Print(vars,
    "$inputclass$.Builder request =\n"
    "    $inputclass$.newBuilder();\n");
  for (int j = 0; j < method->input_type()->field_count(); ++j) {
    const FieldDescriptor* field = method->input_type()->field(j);
    if (field->is_repeated()) {
      printer->Print(
        "if ($name$ != null && $name$.size() > 0)"
        " request.addAll$Name$($name$);\n",
        "Name", UnderscoresToCapitalizedCamelCase(field),
        "name", field->name());
    } else {
      printer->Print(
        "if ($name$ != null) request.set$Name$($name$);\n",
        "Name", UnderscoresToCapitalizedCamelCase(field),
        "name", field->name());
    }
  }
  printer->Print(vars,
    "return $method$(rpc, request.build());\n");
  printer->Outdent();
  printer->Print("}\n\n");
}

}  // namespace java
}  // namespace compiler
}  // namespace protoserv
